Aerogel polystyrene insulation board and preparation method thereof

Abstract

This invention belongs to the technical field of thermal insulation materials. More specifically, it relates to an aerogel polystyrene insulation board and its preparation method. The product of this invention comprises the following raw materials in parts by weight: 140-150 parts cement-based cementitious material, 8-10 parts polystyrene short fibers, 20-25 parts silica aerogel, 25-30 parts closed-cell vitrified microspheres, 2-4 parts water-reducing agent, and 0.5-1.0 parts defoamer; the polystyrene short fibers are polystyrene fibers with a length of 3-12 mm and an aspect ratio of 80-100:1; the cement-based cementitious material is composed of the following raw materials in parts by weight: 100-120 parts fly ash, 30-40 parts quartz sand, 60-80 parts stone powder, 6-8 parts redispersible latex powder, 1.5-2.0 parts cellulose ether, and 1-3 parts polyvinyl alcohol; the surface of the polystyrene short fibers is subjected to plasma treatment and coating with a silane coupling agent. This solves the problem that traditional insulation boards struggle to achieve both low thermal conductivity and high crack resistance.

Description

Technical Field

[0001] This invention belongs to the field of thermal insulation materials technology. More specifically, it relates to an aerogel polystyrene insulation board and its preparation method. Background Technology

[0002] Building energy conservation is a key area for achieving the "dual carbon" goal, and developing high-performance exterior wall insulation materials is a core technological path to reduce building operating energy consumption. Currently, the mainstream exterior wall insulation materials on the market mainly include organic insulation boards (such as molded polystyrene foam board EPS and extruded polystyrene foam board XPS) and inorganic insulation mortars (such as vitrified microsphere insulation mortar).

[0003] Organic insulation materials (such as EPS and XPS) have the advantages of being lightweight and having low thermal conductivity, but their inherent flammability poses a serious fire safety hazard. Furthermore, they have relatively low strength, are prone to aging, and have a limited service life. Conversely, traditional inorganic insulation materials, while non-combustible and aging-resistant, generally suffer from high thermal conductivity and insufficient insulation efficiency. To achieve the designed thermal resistance, it is often necessary to increase the coating thickness, which not only increases the wall load but also occupies more building space.

[0004] To balance thermal insulation performance and fire safety, the industry has developed various composite technologies. For example, aerogel, a solid material with the lowest known thermal conductivity (nanoporous structure), is combined with traditional thermal insulation mortar to improve thermal insulation performance while maintaining the fire-resistant advantages of inorganic materials. However, directly mixing aerogel powder with inorganic cementitious materials (such as cement) results in a significant decrease in the mechanical strength of the composite board due to the inherent high brittleness of the aerogel nanoframework and its interfacial compatibility with the matrix. This leads to cracking, powdering, and difficulty in meeting construction and application requirements.

[0005] On the other hand, when lightweight aggregates (such as polystyrene particles and vitrified microspheres) are added to materials to reduce density, the density difference between the lightweight aggregates and the matrix material can easily cause phase separation (such as floating or settling) during mixing and molding, resulting in an uneven structure in the finished product, which in turn forms thermal bridges and reduces the overall insulation effect. At the same time, the inherent contradiction between lightweight and high strength is also difficult to reconcile.

[0006] Therefore, existing technologies urgently need an innovative solution that can synergistically address the balance between high-efficiency thermal insulation, fire safety, mechanical strength, and lightweighting, and develop a new type of composite insulation board with both ultra-low thermal conductivity and high crack resistance. Summary of the Invention

[0007] The technical problem this invention aims to solve is the difficulty of combining low thermal conductivity and high crack resistance in traditional insulation boards. Based on this challenge, this invention provides an aerogel polystyrene insulation board and its preparation method.

[0008] The purpose of this invention is to provide an aerogel polystyrene insulation board.

[0009] Another object of the present invention is to provide a method for preparing aerogel polystyrene insulation board.

[0010] The above-mentioned objective of this invention is achieved through the following technical solution:

[0011] An aerogel polystyrene insulation board comprises the following raw materials in weight fractions:

[0012] 140-150 parts cement-based cementitious materials, 8-10 parts polystyrene short fibers, 20-25 parts silica aerogel, 25-30 parts closed-cell vitrified microspheres, 2-4 parts water-reducing agent, 0.5-1.0 parts defoamer;

[0013] The polystyrene short fibers are polystyrene fibers with a length of 3-12 mm and an aspect ratio of 80-100:1.

[0014] The closed-cell vitrified microspheres can be purchased from Henan Huazhu Technology Co., Ltd., and the relevant specifications are as follows.

[0015] Sodium lignosulfonate was selected as the water-reducing agent, and polydimethylsiloxane was selected as the defoamer.

[0016] Silica aerogel can be purchased from Guangdong Elisen High-Tech Co., Ltd.

[0017] The beneficial effects of the above technical solution are as follows:

[0018] The above technical solution constructs a synergistic system using cement-based cementitious materials, silica aerogel, closed-cell vitrified microspheres, and polystyrene short fibers. Among them, cement-based cementitious materials serve as the continuous phase, providing basic structural strength and formability; silica aerogel serves as a nanoscale thermal insulation functional component, inhibiting heat conduction and heat convection; the hollow structure of closed-cell vitrified microspheres effectively blocks heat conduction and significantly reduces material density; and polystyrene short fibers serve as the reinforcing and toughening phase, forming a three-dimensional network in the matrix, absorbing and dispersing stress through bridging and crack deflection mechanisms.

[0019] Silica aerogel fills the macroscopic pores between vitrified microspheres, while the rigid framework of the vitrified microspheres provides support for the aerogel, preventing its nanostructure from collapsing under pressure. Together, they form a dual protection system of "micron-level hollow insulation" and "nanoscale porous insulation," achieving stable and comprehensive suppression of heat conduction, convection, and radiation.

[0020] One of the core functions of polystyrene short fibers is to compensate for the inherent brittleness of silica aerogels. Aerogel nanoparticles are prone to becoming the origin of microcracks when subjected to stress, and the fiber network can promptly prevent these microcracks from propagating into macroscopic cracks. At the same time, the fiber network firmly binds aerogel particles and vitrified microspheres in the matrix, preventing them from becoming stress concentration points or falling off and forming defects, thereby transforming brittle functional materials into tough composite materials.

[0021] Through the synergy of the above four factors, the mechanical properties of the material, especially its crack resistance and toughness, are significantly improved while ensuring low thermal conductivity and low density. This effectively solves the core technical problem of low strength and easy cracking of lightweight thermal insulation materials.

[0022] Furthermore, the cement-based binder is composed of the following raw materials in parts by weight:

[0023] 100-120 parts fly ash, 30-40 parts quartz sand, 60-80 parts stone powder, 6-8 parts redispersible latex powder, 1.5-2.0 parts cellulose ether, 1-3 parts polyvinyl alcohol.

[0024] Among them, the redispersible latex powder is VINNAPAS® 5044N produced by Wacker Chemie; the fly ash is commercially available Grade II fly ash with a fineness of no more than 40 mesh and a loss on ignition of less than 8.0%; the quartz sand has a silica content of more than 90% and a particle size of 40-50 mesh; and the stone powder has a fineness of 80-100 mesh and a calcium carbonate content of more than 92%.

[0025] The above technical solution involves incorporating redispersible latex powder and polyvinyl alcohol as organic polymer binders into cement-based cementitious materials. During hydration, this forms a highly tough polymer film that interweaves with inorganic hydration products (CSH gel) to create an organic-inorganic interpenetrating network structure. This significantly improves the matrix's flexibility, cohesion, and interfacial adhesion with various functional phases. The introduction of the polymer component not only enhances the matrix's crack resistance but, more importantly, acts as a "medium," effectively encapsulating and bonding aerogels, vitrified microspheres, and fibers, thus resolving the compatibility issues between components (especially at the inorganic-organic interface).

[0026] Furthermore, the density of the silica aerogel is 0.15-0.25 g / cm³. 3 It has a porosity of 85-92% and a thermal conductivity of 0.008-0.013 W / (m·K).

[0027] Furthermore, the bulk density of the closed-cell vitrified microspheres is 100-120 kg / m³. 3 D50 is 1.5-2.5mm.

[0028] The density ensures sufficient lightweight effect, and D50 limits the median particle size, which is a key parameter. Microspheres within this particle size range can form a good particle size distribution with aerogel powder (the aerogel fills the gaps), while avoiding stress concentration due to excessively large particle size or a large increase in water demand due to excessively small particle size.

[0029] Furthermore, the surface of the polystyrene short fibers is subjected to plasma treatment and coating with a silane coupling agent;

[0030] The plasma treatment and silane coupling agent coating include:

[0031] After plasma treatment, the polystyrene short fibers are immersed in a silane coupling agent solution, coated, washed, and dried.

[0032] Plasma treatment introduces polar functional groups and increases surface roughness into the inert fiber surface, fundamentally altering its surface chemical properties and transforming it from "inert" to "active." One end of the coupling agent molecule (silanol group) forms a strong covalent bond with the plasma-activated fiber surface; the other end (amino, epoxy, etc.) can react chemically or form strong hydrogen bonds with cement hydration products. Through this composite treatment of "physical activation + chemical grafting," a robust "molecular bridge" is constructed between the PS fiber and the cement matrix, upgrading their bond from simple physical-mechanical interlocking to a powerful chemical bond. This significantly enhances the interfacial bonding strength, allowing the fiber to fully exert its bridging and toughening effects, significantly improving the material's tensile strength, impact resistance, and durability, and avoiding the "ineffective addition" of fibers due to weak interfaces.

[0033] Furthermore, the silane coupling agent is selected from any one of silane coupling agents KH-540, KH-550, KH-560, KH-570, and KH-580.

[0034] A method for preparing an aerogel polystyrene insulation board, the specific preparation steps of which include:

[0035] Weigh each component according to the raw material composition, and prepare water at 35-40% of the mass of the cementitious material;

[0036] Cement-based cementitious materials, water-reducing agents, and defoamers are mixed with water to form a basic slurry.

[0037] Add polystyrene short fibers to the base slurry, stir and disperse evenly, then add silica aerogel and closed-cell vitrified microspheres, stir evenly at low speed, pour into the mold, and vibrate to compact;

[0038] After being left to stand at 40-60℃ for 3-6 hours, the material is demolded and left to stand at room temperature for 7 days to obtain aerogel polystyrene insulation board.

[0039] Furthermore, the low-speed mixing includes:

[0040] Mix continuously for 80-100 minutes at a stirring rate of 60-80 r / min.

[0041] The above scheme first forms a matrix slurry to ensure that the cementitious materials and additives are fully dispersed and hydrated; then the fibers are added first, followed by the lightweight aggregates. This order is crucial. The fibers are first fully dispersed in the viscous slurry and encapsulated by the polymer to form a uniform network skeleton, which can effectively "lock in" the extremely light aerogels and vitrified microspheres added later, preventing them from floating and separating during the mixing and casting process, thus ensuring the uniformity of the finished product structure.

[0042] Further low-speed, long-term stirring ensures uniform mixing while minimizing mechanical damage to the aerogel nanostructure and the intact closed-cell spheres of the vitrified microspheres, thus protecting the core functions.

[0043] Furthermore, the specific preparation steps also include:

[0044] Polystyrene short fibers are subjected to plasma treatment in an atmospheric pressure plasma treatment device, with air as the working gas, at a power of 100-120W, a nozzle distance of 10-12mm from the fiber bundle, and a conveying speed with a residence time of 1.2-2.0s.

[0045] The plasma-treated polystyrene short fibers are immersed in an ethanol solution of 1-3% by mass of silane coupling agent, and then an equal mass of deionized water is added. The reaction is then carried out under the conditions of pH 7.8-8.0 and temperature 40-45℃, with stirring for 30-50 minutes. After filtration, washing and drying, the pretreatment of polystyrene short fibers is completed.

[0046] It was then added to the base slurry as a raw material;

[0047] The amount of ethanol solution of the silane coupling agent used is 8-10 times the mass of the plasma-treated polystyrene short fibers. Detailed Implementation

[0048] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0049] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0050] Example 1

[0051] Pretreatment of polystyrene short fibers:

[0052] Polystyrene short fibers were subjected to plasma treatment in an atmospheric pressure plasma treatment device with air as the working gas, at a power of 100W, a nozzle distance of 10mm from the fiber bundle, and a conveying speed with a residence time of 1.2s.

[0053] The plasma-treated polystyrene short fibers were immersed in an ethanol solution of 1% by mass of silane coupling agent, and then an equal mass of deionized water was added. The reaction was carried out under the conditions of pH 7.8, temperature 40℃, and stirring speed 100 r / min for 30 min. After filtration, washing and drying, the pretreatment of polystyrene short fibers was completed.

[0054] The silane coupling agent is selected from silane coupling agent KH-540;

[0055] The amount of ethanol solution of the silane coupling agent used is 8 times the mass of the plasma-treated polystyrene short fibers.

[0056] The polystyrene short fiber is a polystyrene fiber with a length of 3 mm and an aspect ratio of 80:1;

[0057] Raw material preparation:

[0058] Based on the following weight proportions: 140 parts cement-based cementitious material, 8 parts polystyrene short fiber, 20 parts silica aerogel, 25 parts closed-cell vitrified microspheres, 2 parts water-reducing agent, and 0.5 parts defoamer.

[0059] The cement-based binder is composed of the following raw materials in parts by weight:

[0060] 100 parts fly ash, 30 parts quartz sand, 60 parts stone powder, 6 parts redispersible latex powder, 1.5 parts cellulose ether, 1 part polyvinyl alcohol;

[0061] The density of the silica aerogel is 0.15 g / cm³. 3 It has a porosity of 85% and a thermal conductivity of 0.008 W / (m·K).

[0062] The density of the closed-cell vitrified microspheres is 100 kg / m³. 3 D50 is 1.5mm;

[0063] Weigh each component according to the above raw material composition, and prepare water equal to 35% of the mass of the cementitious material;

[0064] After mixing cement-based cementitious materials, water-reducing agents, and defoamers with water, the mixture is stirred at a speed of 80 r / min for 30 min to form a basic slurry.

[0065] Add polystyrene short fibers to the base slurry, continue to stir and disperse at a speed of 180 r / min for 40 min, then add silica aerogel and closed-cell vitrified microspheres, and continue to stir and mix at a low speed of 60 r / min for 80 min, then pour into a mold and vibrate to compact.

[0066] After being cured at 40℃ for 3 hours, the material is demolded and left to stand at room temperature for 7 days to obtain aerogel polystyrene insulation board.

[0067] Example 2

[0068] Pretreatment of polystyrene short fibers:

[0069] Polystyrene short fibers were subjected to plasma treatment in an atmospheric pressure plasma treatment device with air as the working gas, at a power of 110W, a nozzle distance of 11mm from the fiber bundle, and a conveying speed with a residence time of 1.6s.

[0070] The plasma-treated polystyrene short fibers were immersed in an ethanol solution of 2% silane coupling agent by mass, and then an equal mass of deionized water was added. The reaction was carried out under the conditions of pH 7.9, temperature 42℃, and stirring speed 100 r / min for 40 min. After filtration, washing and drying, the pretreatment of polystyrene short fibers was completed.

[0071] The silane coupling agent is selected from silane coupling agent KH-550;

[0072] The amount of ethanol solution of the silane coupling agent used is 9 times the mass of the plasma-treated polystyrene short fibers.

[0073] The polystyrene short fiber is a polystyrene fiber with a length of 6 mm and an aspect ratio of 90:1;

[0074] Raw material preparation:

[0075] Based on the following weight proportions: 145 parts cement-based cementitious material, 9 parts polystyrene short fiber, 22 parts silica aerogel, 28 parts closed-cell vitrified microspheres, 3 parts water-reducing agent, and 0.8 parts defoamer.

[0076] The cement-based binder is composed of the following raw materials in parts by weight:

[0077] 110 parts fly ash, 35 parts quartz sand, 70 parts stone powder, 7 parts redispersible latex powder, 1.8 parts cellulose ether, 2 parts polyvinyl alcohol;

[0078] The density of the silica aerogel is 0.2 g / cm³. 3 It has a porosity of 90% and a thermal conductivity of 0.01 W / (m·K).

[0079] The density of the closed-cell vitrified microspheres is 110 kg / m³. 3 D50 is 2mm;

[0080] Weigh each component according to the above raw material composition, and prepare water equal to 38% of the mass of the cementitious material;

[0081] After mixing cement-based cementitious materials, water-reducing agents, and defoamers with water, the mixture is stirred at a speed of 90 r / min for 30 min to form a basic slurry.

[0082] Add polystyrene short fibers to the base slurry, and continue to stir and disperse at a speed of 190 r / min for 40 min. Then add silica aerogel and closed-cell vitrified microspheres, and continue to stir and mix at a low speed of 70 r / min for 90 min. Then pour into a mold and vibrate to compact.

[0083] After being cured at 50℃ for 4 hours, the material is demolded and left to stand at room temperature for 7 days to obtain aerogel polystyrene insulation board.

[0084] Example 3

[0085] Pretreatment of polystyrene short fibers:

[0086] Polystyrene short fibers were subjected to plasma treatment in an atmospheric pressure plasma treatment device with air as the working gas, at a power of 120W, a nozzle distance of 12mm from the fiber bundle, and a conveying speed with a residence time of 2.0s.

[0087] The plasma-treated polystyrene short fibers were immersed in an ethanol solution of 3% silane coupling agent, and then an equal mass of deionized water was added. The mixture was then stirred and hydrolyzed for 50 minutes at a pH of 8.0, a temperature of 45°C, and a stirring speed of 100 r / min. After filtration, washing, and drying, the pretreatment of polystyrene short fibers was completed.

[0088] The silane coupling agent is selected from silane coupling agent KH-560;

[0089] The amount of ethanol solution of the silane coupling agent used is 10 times the mass of the plasma-treated polystyrene short fibers.

[0090] The polystyrene short fiber is a polystyrene fiber with a length of 12 mm and an aspect ratio of 100:1;

[0091] Raw material preparation:

[0092] By weight, take 150 parts of cement-based cementitious material, 10 parts of polystyrene short fiber, 25 parts of silica aerogel, 30 parts of closed-cell vitrified microspheres, 4 parts of water-reducing agent, and 1.0 part of defoamer.

[0093] The cement-based binder is composed of the following raw materials in parts by weight:

[0094] 120 parts fly ash, 40 parts quartz sand, 80 parts stone powder, 8 parts redispersible latex powder, 2.0 parts cellulose ether, 3 parts polyvinyl alcohol;

[0095] The density of the silica aerogel is 0.25 g / cm³. 3 It has a porosity of 92% and a thermal conductivity of 0.013 W / (m·K).

[0096] The density of the closed-cell vitrified microspheres is 120 kg / m³. 3 D50 is 2.5mm;

[0097] Weigh each component according to the above raw material composition, and prepare water equal to 40% of the mass of the cementitious material;

[0098] After mixing cement-based cementitious materials, water-reducing agents, and defoamers with water, the mixture is stirred at a speed of 100 r / min for 30 min to form a basic slurry.

[0099] Add polystyrene short fibers to the base slurry, and continue to stir and disperse at a speed of 200 r / min for 40 min. Then add silica aerogel and closed-cell vitrified microspheres, and continue to stir and mix at a low speed of 80 r / min for 100 min. Then pour into a mold and vibrate to compact.

[0100] After being cured at 60℃ for 6 hours, the material is demolded and left to stand at room temperature for 7 days to obtain aerogel polystyrene insulation board.

[0101] Example 4

[0102] The difference between this embodiment and Embodiment 1 is as follows:

[0103] Add polystyrene short fibers to the base slurry, and continue to stir and disperse at a speed of 180 r / min for 40 min. Then add silica aerogel and closed-cell vitrified microspheres, and continue to stir and mix at a stirring speed of 120 r / min for 80 min. Then pour into a mold and vibrate to compact.

[0104] All other conditions remain unchanged.

[0105] Example 5

[0106] The difference between this embodiment and Embodiment 1 is as follows:

[0107] The polystyrene short fibers were added directly to the product without pretreatment, while all other conditions remained unchanged.

[0108] Comparative Example 1

[0109] The difference between this comparative example and Example 1 is as follows:

[0110] No polystyrene short fibers were added, and all other conditions remained unchanged.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 1 is as follows:

[0113] No closed-cell vitrified microspheres were added, and all other conditions remained unchanged.

[0114] Comparative Example 3

[0115] The difference between this comparative example and Example 1 is as follows:

[0116] Polystyrene fibers with a length of 18 mm were used to replace short polystyrene fibers, while other conditions remained unchanged.

[0117] Comparative Example 4

[0118] The difference between this comparative example and Example 1 is as follows:

[0119] First, add silica aerogel and closed-cell vitrified microspheres, and then add polystyrene short fibers after the first two, keeping all other conditions unchanged.

[0120] The performance tests conducted on the products obtained from the above embodiments or comparative examples are as follows: The specific test methods and test results are shown below:

[0121] Thermal insulation performance assessment:

[0122] According to GB / T 10294 "Determination of Steady-State Thermal Resistance and Related Properties of Thermal Insulation Materials - Protective Hot Plate Method", the thermal conductivity of the product is tested by placing a specimen of specified dimensions between two parallel plates: a heating plate and a cooling plate. By establishing a stable unidirectional heat flow field, the heat flux density through the specimen, the specimen thickness, and the temperature difference between the two sides are measured, and the thermal conductivity is finally calculated.

[0123] Mechanical performance evaluation:

[0124] According to GB / T 5486 "Test Methods for Inorganic Rigid Thermal Insulation Products", the compressive strength of the product is tested by placing the specimen between two parallel plates of a compression testing machine. A continuous and uniform load is applied at a specified rate until the specimen fails. The maximum load is recorded, and the compressive strength is calculated as: Compressive Strength = Maximum Load / Specimen Compressed Area.

[0125] According to GB / T 19686 "Rock Wool Insulation Products for Buildings", the bending strength of the product is tested by applying a bending load to a specimen of specified dimensions through a three-point bending test until the specimen fails. The bending strength is calculated by recording the maximum failure load and the specimen dimensions.

[0126] Detailed test results are shown in Table 1;

[0127] Table 1: Product Performance Evaluation Results

[0128]

[0129] As can be seen from the test results in Table 1, the product obtained by this invention can effectively balance thermal insulation performance and good mechanical properties.

[0130] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. Aerogel polystyrene thermal insulation board, characterized by, The ingredients include the following parts by weight: 140-150 parts cement-based cementitious materials, 8-10 parts polystyrene short fibers, 20-25 parts silica aerogel, 25-30 parts closed-cell vitrified microspheres, 2-4 parts water-reducing agent, 0.5-1.0 parts defoamer; The polystyrene short fibers are polystyrene fibers with a length of 3-12 mm and an aspect ratio of 80-100:1; The cement-based binder is composed of the following raw materials in parts by weight: 100-120 parts fly ash, 30-40 parts quartz sand, 60-80 parts stone powder, 6-8 parts redispersible latex powder, 1.5-2.0 parts cellulose ether, 1-3 parts polyvinyl alcohol.

2. The aerogel polystyrene thermal insulation board according to claim 1, characterized in that, The density of the silica aerogel is 0.15-0.25 g / cm 3 The porosity is 85-92%, and the thermal conductivity is 0.008-0.013 W / (m·K).

3. The aerogel polystyrene insulation board according to claim 1, characterized in that, The bulk density of the closed-cell vitrified microsphere is 100-120 kg / m 3 , and D50 is 1.5-2.5 mm.

4. The aerogel polystyrene insulation board according to claim 1, characterized in that, The surface of the polystyrene short fibers is subjected to plasma treatment and coating with a silane coupling agent; The plasma treatment and silane coupling agent coating include: After plasma treatment, the polystyrene short fibers are immersed in a silane coupling agent solution, coated, washed, and dried.

5. The aerogel polystyrene insulation board according to claim 4, characterized in that, The silane coupling agent is selected from any one of silane coupling agents KH-540, KH-550, KH-560, KH-570, and KH-580.

6. A method for preparing an aerogel polystyrene insulation board as described in any one of claims 1-5, characterized in that, The specific preparation steps include: Weigh each component according to the raw material composition, and prepare water at 35-40% of the mass of the cementitious material; Cement-based cementitious materials, water-reducing agents, and defoamers are mixed with water to form a basic slurry. Add polystyrene short fibers to the base slurry, stir and disperse evenly, then add silica aerogel and closed-cell vitrified microspheres, stir evenly at low speed, pour into the mold, and vibrate to compact; After being cured at 40-60℃ for 3-6 hours, the material is demolded and left to stand at room temperature for 7 days to obtain aerogel polystyrene insulation board.

7. The method for preparing an aerogel polystyrene insulation board according to claim 6, characterized in that, The low-speed mixing includes: Mix continuously for 80-100 minutes at a stirring rate of 60-80 r / min.

8. The method for preparing an aerogel polystyrene insulation board according to claim 6, characterized in that, The specific preparation steps also include: Polystyrene short fibers are subjected to plasma treatment in an atmospheric pressure plasma treatment device, with air as the working gas, at a power of 100-120W, a nozzle distance of 10-12mm from the fiber bundle, and a conveying speed with a residence time of 1.2-2.0s. The plasma-treated polystyrene short fibers are immersed in an ethanol solution of 1-3% by mass of silane coupling agent, and then an equal mass of deionized water is added. The reaction is then carried out under conditions of pH 7.8-8.0 and temperature 40-45℃, with stirring for 30-50 minutes. After filtration, washing and drying, the pretreatment of polystyrene short fibers is completed. It was then added to the base slurry as a raw material; The amount of ethanol solution of the silane coupling agent used is 8-10 times the mass of the plasma-treated polystyrene short fibers.

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